Electrical temperature-recorder.



M. E. TAYLORE, ELECTRICAL TEMPERATURERBCOEDER. APPLICATION FILED MAY`53,`1910- 1,047,855, Patented Deo. A17. 191.

Suva/nto@ mmrdayzw UNITED sTATEs PATENT oEEroE. I

Minna-.an E. Tarifen, or asHTABuLa, oHro.

ELECTRICAL TEMPERATURE-RECQRDEE.

To all 707mm #may concern Be it known that I, MILLARD E. TAYLOR, a citizen of the United States, residing at Ashtabula, in the county of Ashtabula and State of hio, have invented certain new and useful improvements in Electrical Tempcinture-Recorders, of which the following is a specication.

This invention relates to improvement-s in temperature recorders, and has for one ot its objects a provision of a series of t-hermometers disposed in series and connected to a common register or indicator.

Another objectis to provide an improved construction of thermometer, and one which is Very sensitive to changes in temperature.

`With these andlother objects in view, the invention consists in the construction, combinationl and arrangement ot parts as willr be more fully hereinafter described and pointed out in the claim, but it will be understood that changes in the specific structure may be made within the scope ot the claim, Without departing from the spirit oi the invention.

In the drawings: Figure l is a' diagrammatic view if the thermometer, Fig. 2 is a rear elevation of the thermometer, the casing being removed, and Fig. 3 is a vertical sectional View of the thermometer.

Referring particularly to the drawings, l.

represents a 4thermometer located in any suitable place or room of a building, which comprises a casingr 6 1n the front portion of which is secured a dial 7 on the face of which and adjacent the periphery thereof, is disposed in circular series Va plurality of contact plates4 8, connected by means of the resistances 9.

In the practical use of the device there is aplurality of these thermometers located at various points in a building, and all in cire cuit with an indicator located in the furnace room or engine room.

Mounted on the arbor 10, is an indicator hand 1l, on the outer end of which and adapted. to bearV on the contact plates 8 is a contact finger 12. To thecon'tact plate` 13 is connected a wire 14, which leads to the engine room. A conlmon return wire 16.

is connected to the arbor 1 0, ot' thethermometer and leads to an indicator also located in the engine room, but not shown. rihe arbor of thethermometer is connected directly to this return wire 16 so that a cur- Specication of Letters Patent.

Application led May 6, 1910. Serial No. 559,716.

Patented Dec. 17, 1912.'

be seen that, secured to the partition 23, 6o

within the casing, by means of the bracket 24 is a thermostatic bar 25, said bar comprising two strips of unlike metals. These strips comprise the horizontal straight portions 26, the outer ends of which bow up- 654 wardly from the point 27. To the tree end of the bowed portion of the bar 25 is attached a cord 28 which is wound a number of times around the drum 29 on the arbor` ot the indicator hand. The opposite end ot' the cord 28 is secured to one end ofthe spring 30 which spring has its other end attached to an adjusting screw 31, passing through an aperture in a bracket 32. By

means of this adjusting screw 31 the tension 75 of the spring 30, is varied to adjust the hand to the pro-per position on the dial. 'To take the current ott the arbor ofthe indicator hand I have provided the spring contact linger 33 secured to the rear of the cover of 80 the casing and contacting with the end of the arbor, said spring at' its other end'being secured to and insulated from the casing, as at l5 1n Flg. 3.

As sh'own in Fig. 2 an expansion of the 85 thermostatic bar 25 will pull the cord A28 against the tensionof the spring 30, and a. reduction of the temperature will tend to allow the bar to assume its normal position ermitting-the spring to contract andy pull- 90.

ing on the cord 28, rotate the hand back to its original position.

By means of the present invent-ion the temperature of any locality is accurately determined at a -point of heat supply by the simple throwing of a switch arm, the there monieter accurately indicating the rise and fall ot' temperature.

vWhat is claimed is:

A thermometer comprising a casing, a bracket in the casing, and which is secured to the wall'ot the casing, a thermostatic bar having astraightyportion secured to said n bracket,- said' straifht portion extending to;`

ward the center ol? the casing, said thermo; 'A105 static bar having its outer end upwzxyllylfl bowed, anarbor within the casing andcar-f" rying an indicator hand, a contact.finger engaging-one end of thc arbor, a cord attached at one end to the free end of the '110` ioov 

